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Sharapova's Wimbledon triumph

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The men were also in quarterfinal action on Friday with France's Julien Benneteau bringing Stanilas Wawrinka's tournament to a premature end.

Apart from a semifinal appearance two seasons ago, the Swiss has a poor record in Cincinnati having tumbled out in the first or second round on five previous occasions.

Wawrinka looked on course to equal his best ever showing as he raced to a one set lead in just 27 minutes.

But the tide soon turned in Benneteau's favor as the Frenchman dominated the remaining two sets breaking the world No. 4's serve four times to run out a 1-6 6-1 6-2 winner in 80 minutes.

"It's my best result in a Masters 1000," Benneteau said, the ATPTour website reported.

"The Masters 1000 are very, very difficult tournaments because the cut is like 40, 45. It's top 45 players in the world on every tournament at this level. You don't have a lot of opportunities to make a very big result," Benneteau added.

Victory sees him become the first Frenchman to advance to the semis at the event for 15 years -- Arnaud Clement eventually lost out to eventual winner Thomas Enqvist of Sweden in 2000.

The world No. 41 will face either Spain's Tommy Robredo, who beat world No. 1 Novak Djokovic in the previous round, or world No. 6 David Ferrer.